Creating reports that show only the columns where values are present

I skimmed the above - if you're trying the exact same technique as what's referenced you will get blocked - as Quickbase disabled any injection of javascript or iFrame type techniques in 2021 for security reasons. You can try a couple things though perhaps: 

1. Try and generate the same 'API_GenResultsTable' similar to the above - and put that url into a Formula-URL field and enable it to show as an iframe. That is the only method that would allow you to use the iFrame technique. Essentially it's the same as the rich-text technique, you're just not actually putting the <iframe> tag in, just the URL string.

     2. The other option which might get hairy and very taxing on QB - if you're really just trying to control the columns, you could use 'formula-queries to actually check the fields that you want to show/hide. So you can check for example if fid 7 has values in it, and if it does, include it in your clist, if it doesn't leave it out. If you have 40 fields that will be very taxing on QB though so use with caution.